POSITIVE ELECTRODE MATERIAL, PREPARATION METHOD THEREFOR AND USE THEREOF, AND LITHIUM ION BATTERY

The present invention relates to the field of lithium ion battery positive electrode materials, and discloses a positive electrode material, a preparation method therefor, a use thereof, and a lithium ion battery. The positive electrode material is formed by agglomerating primary particles to form secondary particles; and by means of BJH, the secondary particles obtain phase apertures d10, dso and d90 that meet the following phase system: 10nm≤d50≤40nm; 1≤k90≤8; wherein k90=(d90-d10)/d50. The positive electrode has a specific apertures, apertures distribution, apertures area and microcrystalline structure, so that during the charging and discharging processes of the lithium ion battery prepared from the positive electrode material, the short-term performance, such as the first charging and discharging capacity and long term performance, such as capacity retention ratio can be improved.